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1.
Leaving a party in the morning without bothering to say goodbye to any of your friends. Occasionally an entire party will do this to one person, leaving him/her with only the house owner. It is a depressing experience.
"Dude, everyone Sunshined me last night. I was the only person left in that weird guys house!"

"Where did she go? I think she totally Sunshined us!"
by SUNSHINED! March 19, 2010
 
2.
To take advantage of a friends generosity.
She sunshined me when she let me buy all night then left with my brother and didn't even say goodnight
by ficklefingeroffate December 17, 2013
 
3.
the art of a woman mooning with her virginal
My girlfriend sunshined me when i came home from work
by marvelous569 October 22, 2008